On Sat, Aug 07, 2010 at 06:32:39PM +0400, Kirill Smelkov wrote: > Hello up there! > > I'm from Debian land where we'll use binutils 2.20 for the next release. > > However as you've probably already learned from Fedora DSO Link Change, > -no-add-needed was breaking cases with weak symbols involved. In particular > when linking C++ programs to libraries linked to libpthread.so without > -lpthread for program itself was problematic -- See e.g. this thread > > http://www.mail-archive.com/[email protected]/msg00042.html > > and my example: > > ---- 8< Makefile ---- > # $ make > # g++ -Wl,-no-add-needed -shared -o lpthread.so -lpthread > # g++ -Wl,-no-add-needed -o deb591405 deb591405.cpp lpthread.so > # /usr/bin/ld: ,: invalid DSO for symbol `pthread_cancel@@GLIBC_2.0' > definition > # /lib/libpthread.so.0: could not read symbols: Bad value > CXX := g++ > CXXLD := $(CXX) -Wl,-no-add-needed > #CXXLD := $(CXX) > > deb591405: deb591405.cpp lpthread.so > $(CXXLD) -o $@ $+ > > lpthread.so: > $(CXXLD) -shared -o $@ -lpthread > > > ---- 8< deb591405.cpp ----- > /* c++-progs -> library -> pthread > * > * 1. library links to pthread explicitly > * 2. c++-prog does not link to pthread > * > * 3. libstdc++ weakly pulls pthread_cancel, which confuses linker when > * building with -Wl,no-add-needed > * > * See http://bugs.debian.org/591405 > */ > > #include <string> > #include <iostream> > using namespace std; > > int main() > { > string msg = "I hope Debian bug #591405 has been fixed!\n"; > > cout << msg; > return 0; > } > > > > Things are fixed on binutils trunk, but binutils-2_20-branch still has the > problem. > > Is it somehow possible to please apply fixes to 2.20 too? If yes, I've > prepared backported patches, which go as replies to this email. > > > Thanks beforehand, > Kirill
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